ComboBoxTest.java Source code

Introduction

Here is the source code for ComboBoxTest.java

Source

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
    
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
    
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * @version 1.33 2007-06-12
 * @author Cay Horstmann
 */
public class ComboBoxTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {

                ComboBoxFrame frame = new ComboBoxFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * A frame with a sample text label and a combo box for selecting font faces.
 */
class ComboBoxFrame extends JFrame {
    public ComboBoxFrame() {
        setTitle("ComboBoxTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        // add the sample text label

        label = new JLabel("The quick brown fox jumps over the lazy dog.");
        label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
        add(label, BorderLayout.CENTER);

        // make a combo box and add face names

        faceCombo = new JComboBox();
        faceCombo.setEditable(true);
        faceCombo.addItem("Serif");
        faceCombo.addItem("SansSerif");
        faceCombo.addItem("Monospaced");
        faceCombo.addItem("Dialog");
        faceCombo.addItem("DialogInput");

        // the combo box listener changes the label font to the selected face name

        faceCombo.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                label.setFont(new Font((String) faceCombo.getSelectedItem(), Font.PLAIN, DEFAULT_SIZE));
            }
        });

        // add combo box to a panel at the frame's southern border

        JPanel comboPanel = new JPanel();
        comboPanel.add(faceCombo);
        add(comboPanel, BorderLayout.SOUTH);
    }

    public static final int DEFAULT_WIDTH = 300;
    public static final int DEFAULT_HEIGHT = 200;

    private JComboBox faceCombo;
    private JLabel label;
    private static final int DEFAULT_SIZE = 12;
}